/// Triggers the initial AVAssetDownloadTask for a given Asset.
public void DownloadAsset(MusicAsset asset)
{
// For the initial download, we ask the URLSession for an AVAssetDownloadTask
// with a minimum bitrate corresponding with one of the lower bitrate variants
// in the asset.
// TODO: workaround for bug https://bugzilla.xamarin.com/show_bug.cgi?id=44201 to get it to build in Mobile Center
var taskOptions = new NSDictionary(new NSString("AVAssetDownloadTaskMinimumRequiredMediaBitrateKey"), new NSNumber(265000));
// should be this
// var taskOptions = new AVAssetDownloadOptions { MinimumRequiredMediaBitrate = 265000 };
var task = assetDownloadURLSession.GetAssetDownloadTask(asset.UrlAsset, asset.Id, null, taskOptions);
// To better track the AVAssetDownloadTask we set the taskDescription to something unique for our sample.
task.TaskDescription = asset.Id;
activeDownloadsMap [task] = asset;
task.Resume();
AssetDownloadStateChanged?.Invoke(this, new MusicAssetDownloadStateChangeArgs(asset.Music, MusicAssetDownloadState.Downloading));
}
internal void DownloadAssetStream(Asset asset)
{
// Get the default media selections for the asset's media selection groups.
var preferredMediaSelection = asset.UrlAsset.PreferredMediaSelection;
///*
// Creates and initializes an AVAggregateAssetDownloadTask to download multiple AVMediaSelections
// on an AVURLAsset.
// For the initial download, we ask the URLSession for an AVAssetDownloadTask with a minimum bitrate
// corresponding with one of the lower bitrate variants in the asset.
// */
AVAggregateAssetDownloadTask task = null;
try
{
var dictionary = new NSDictionary <NSString, NSObject>(new NSString("AVAssetDownloadTaskMinimumRequiredMediaBitrateKey"), (NSObject)(new NSNumber(265_000)));
task = assetDownloadUrlSession.GetAssetDownloadTask(asset.UrlAsset,
new AVMediaSelection[] { preferredMediaSelection },
asset.Stream.Name,
null,
dictionary);
task.TaskDescription = asset.Stream.Name;
activeDownloadsMap.Add(task, asset);
task.Resume();
var userInfo = new Dictionary <string, object>();
userInfo[Asset.Keys.Name] = asset.Stream.Name;
userInfo[Asset.Keys.DownloadState] = AssetDownloadState.Downloading.ToString();
userInfo[Asset.Keys.DownloadSelectionDisplayName] = GetDisplayNamesForSelectedMediaOptions(preferredMediaSelection);
var userInfoDictionary = NSDictionary.FromObjectsAndKeys(userInfo.Values.ToArray(), userInfo.Keys.ToArray());
NSNotificationCenter.DefaultCenter.PostNotificationName(AssetPersistenceManager.AssetDownloadStateChanged, null, userInfoDictionary);
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
}
}
/// Triggers the initial AVAssetDownloadTask for a given Asset.
public void DownloadAsset(MusicAsset asset)
{
Track.Download(asset.Music);
// For the initial download, we ask the URLSession for an AVAssetDownloadTask
// with a minimum bitrate corresponding with one of the lower bitrate variants in the asset.
var taskOptions = new AVAssetDownloadOptions {
MinimumRequiredMediaBitrate = 265000
};
var task = assetDownloadURLSession.GetAssetDownloadTask(asset.UrlAsset, asset.Id, null, taskOptions);
// To better track the AVAssetDownloadTask we set the taskDescription to something unique for our sample.
task.TaskDescription = asset.Id;
activeDownloadsMap [task] = asset;
task.Resume();
AssetDownloadStateChanged?.Invoke(this, new MusicAssetDownloadStateChangeArgs(asset.Music, MusicAssetDownloadState.Downloading));
}